The Lubricant | Diffusion Pump LVO520 Oil (125 ml) is a Leybold LVO 520 high-vacuum diffusion pump fluid, formulated for use in HSR and Agilent oil diffusion pumps used to achieve the ultra-deep vacuum required for molecular distillation. LVO 520 silicone-based pump fluid provides extremely low vapor pressure and excellent thermal stability at diffusion pump operating temperatures. Available in 125 ml bottles; use exclusively in oil diffusion pumps — do not mix with rotary pump oils. Compatible with HSR diffusion pumps on VTA VKL and VKS series distillation systems.